stdlib: refactor standard_services to use set defaults if applicable

This is a suggested diet for the standard_services that'd slim it down quite a bit. What do you think?

Idea here is that only thing needed for new service is to add its pattern to the list. That is, if the service follows the same path most of the services already do:

* `$(service)` == basename of the init script
* `$(state)` == argument for the init script
* The init script lives in `/etc/init.d`

This is still compatible with the more verbose service definitions.